137947931 has 8 divisors (see below), whose sum is σ = 151896384. Its totient is φ = 124234120.

The previous prime is 137947907. The next prime is 137947933. The reversal of 137947931 is 139749731.

137947931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137947931 is a prime.

It is a super-2 number, since 2×137947931² = 38059263334361522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137947933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57425 + ... + 59778.

It is an arithmetic number, because the mean of its divisors is an integer number (18987048).

Almost surely, 2^137947931 is an apocalyptic number.

137947931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

137947931 is a deficient number, since it is larger than the sum of its proper divisors (13948453).

137947931 is a wasteful number, since it uses less digits than its factorization.

137947931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117321.

The product of its digits is 142884, while the sum is 44.

The square root of 137947931 is about 11745.1237115664. The cubic root of 137947931 is about 516.6999232611.

The spelling of 137947931 in words is "one hundred thirty-seven million, nine hundred forty-seven thousand, nine hundred thirty-one".